Exhaust steam injector



Jan. 1, 1935. E. RAWSON EXHAUST STEAM INJECTOR Filed Feb. 8. 1933 INVENTOR. fMA/Vl/L RAM/so ATTORNEY.

Patented Jan. 1 1935 I UNI I" I Q 7 .Emanuerltawsom Noith lirgenQ'N-L, assignor to The Super-heater. Company, New York, N. Y.

pplieafionremary as, asset No. 055,710

.t iaims. (Giana-$2651 My invention relates-to "exhauststeam 'injec eration In the *Qrdinary arrangementsuch sup torsand'aimsto providean arrangementadapted 'p'lemental steam passes directly to a nozzle of to increase thecommercial 'efliciency of sueh-de- "censtant orificeppemng, so that the flow of live -vices. l l r steam is substantially constant irrespectiveof '15 7 Commercial exhaust steam inflectors employ 'otherconditions '"of operation of the injector.

not only exhaust steam, but also-supplementary hepressure 'of-exhaust steam supplied through :Iive steam. Such supplemental steamis nec- "pipe l 2-; however, varies widely-.' Forinstance, essa-ry-tomaintain the device in operation under while the average exhaust steam injector decertainconditions -encount'ered-m average"prac signed-to operate on exhaust steam pressures 10 tice, .but under certain operatingconditions, it evens-lower than-one-halfpoundper square-inch l0 is #possible to employ-more exhaust-steam and *gaugeythepressureof-exhaust steam frequently lessusuppIementa'I live steam than under other runs ab'ove pounds. The nozzle for the supconditions. Ofi coursathe less live steam and *l fl .hOWeVer, must the d d 1 the more exhaust steanrused the greater are-the maintain the; injectorinoperation at some 15 fuel an'd'water-savings-of the steam generating definite lower limit of exhauststeam pressure. 15 apparatus supplied by the injector. The savings Atall pressures above such lower'limit, enough :thus indicated are tat? present erily slightly exhaust steam is availableso that the injector availedof, if at all. r would remain in operation and function satis-.

:It is ancobjeo't of my invention to provideian i'actorilyif the supply-of =1ive steam were reduced arrangementwherebylthetotal zamount of sup :and a grea'ter amount of exhaust steam could '20 ;p1ementa1,;1ive Steam -lb gidgmbly thenbe utilized to increase the fuel saving.

r du ed-as compared Iwithatha't irew-with 'The -foregoingdiscussion as-to-exhauststeam presentarrangements. .and live steam has assumed that the temperalnrorder thatmy invention, together with its ture of the feed water has remained constant.

objects. and advantages, may be fully andreadfly Tnis isnot true under alloperating conditions, 25 "understood, 1min now describe in deta'il and i'n howev r, w Wa p at s ft n flu connection with the:accompanying drawing, aptua'te over-a very wide range. It so happensthat paratus .forfuse zwithanxexhaust steam injectur the-amount of supplemental live steam required forthe purpose stated, this apparatus be'ing 'bysthe injector increases with increase "of 'tem-= selectedmby way of example from a number-of perature of the feed water. 39 possible embodiments of my invention; the -Briefly stated, the apparatus herein disclosed drawing: T provides automatic means whereby the supply or it Fig, 1 .is 'an elevational view of-apparatu-s-emsupplemental live steam to the injector 10 is debodying :my invention; creased upon "increase of pressure ofexhairst Fig. 2 .isafragmentary detail in 'sect-ion bn a-n steam-supply andincreasedppon'increase of tem- 35 enlarged scale" :or a portion of an apparatus perature 'of the feed-water supply. However, I similar to that illustrated at Fig. 1, but incite: do'not limit myself to the use of both such autoing some additional features. matic' means in a given apparatus. At times'I In the drawing, 10 indicatesasa whole'an inmaav empl v 011B 'W e t er.

40 jector apparatus' of a known type having nozzles, In the arrangement illustrated for regulating 40 not shown, ."for utilizingexhaus't' steam an :the the supply of supplemental live steam, Ihave .prorequired amount of supplemental live ste'am.-"In vided adoublebeat valve '24 '(Fig. 2) in valve the arrangement "shown. exhaust steam is --conohamberflfi, '1Valve 24 has a stem 28 which ex-.-

y ducted to the injector by the pipe--12 and tends throug hthe casing26. 30 is'an 'expansible plemental :live: 'steamis conducted to'finject'or chamber preferably of the ordinary sylphon type 45 10 by pipe 14. Auxiliary live-steam to takethe fermednf a cylinder of thin corrugated "metal, place of .exhaustssteam; when such is not availone end-of'whic'h is free *but closed and the other able, is brought to injector 10 by pipe 16. Feedis closed and fixed to astationary support 32. The water is supplied to the injector 10 through the outer end of valve stem 28 is secured to the free pipe 18 and the pipe 20 serves to convey the disend of chamber 30. The interior of the chamber 50 charge from the injector to the boiler. The 30 contains exhaust steam at the pressure existusual overflow pipe is shown at 22. ing in the pipe 12, such steam being conducted The live steam supplied through pipe 14 is at to chamber 30 through support 32 by means of substantially constant pressure throughout the pipe 34. As is evident from Fig. 2, an increase major portion of the time the apparatus is in opin the pressure of the exhaust steam will expand 55 prises springs 48 and 48a.

injector 10 may very conveniently also be asso-; ciated with the valve stem 28. Inthe arrangement shown, a thermostat member 36 is placed in the pipe 18 for the water supply to injector 10,

Member 36 is of a known type of thermostat containing a liquid boiling at a low temperature and member 36 is connected by pipe 38 to'a second sylphon chamber 40. When the temperature of the water in pipe 18 rises, the increase m 'ressure of the liquid within member 36 is transmitted through pipe 38 to the interior of chamber 40. Chamber 40 is shown as mounted on the same support 32 as chamber 30. Motion of the free end of chamber 40 caused by changes in pres sure in the pipe 38 are transmitted to the valve stem 28through a lever 42 which is pivoted intermediate its ends to a fixed support 44 and has its oneend pivoted to the stem 28 andits other end pivoted'to a projection or stem 46 which is connected in turn to the freeend of the-sylphon chamber 40. It will be seen that an increase in pressure in chamber 40 tends to expand it and to open thevalve 24, such action being resisted by the spring means referred to above.

As illustratedin Fig. 2, such spring means com- Spring 48 rests at one end upon an abutment 49 and presses at its other endagainst the end of stem 46. Spring 48a rests at one end against a portion of casing 26 and at the other end against a ring 50 fixed to stem 28. Springs 48 and 48a are preferably so chosen that'valve 24 assumes a mean position when the pressure of exhaust steam in pipe 12 is at its mean value and the temperatureof feed water in pipe 18 also is at its mean value. As

the pressure of exhaust and/or the temperature of the, feed varies, the position of valve 24 is automatically shifted by the expansion and/or contraction of chambers 30 and 40 so as to permit the flow through such valve of the optimum amount of live supplementary steam for the injector 10. While the resiliency of chambers 30 and 40 tends to assist the action of springs-48 and 48a, the spring action of such chambers is usually slight and difficult to predict. There fore the spring means preferably is suiiiciently stiff so that the resiliency oi the walls ofchambers 30 and 40 has a negligible effect on the-posttion of valve 24. Preferably, also, both spring; 48 and spring 48a are used, but I do not limitmyself to'this, the arrangement of Fig. 1 having only the spring 48. When only one springis used, it,of course, must have one end fastenedto the abutment and the other end fastenedto the movable member so as to act in tension aswell as in compression. Preferably also the stem 28 of valve 24 contains a means of adjustment. Such a means is illustrated as a threaded joint at 28A (Fig. 2) and a jam nut 29 to hold the valve in adjusted position. The position of valve 24 at the time the chambers 30 and 40, or either of them, are in their mean positions can be determined to obtain the optimum results in operation. In Fig. 1, however, the joint at 28A has been omitted.

. The actual position of valve 24 will,"in use,

evidently b e'deterrriined by the exhaust pressure 7 and by the temperature of the feed water as it arrives at the injector. The amount of live steam is cut "down inproportion as the pressure of the exhauststeam and the temperature at the feed water make 'thisi'possible thereby avoiding the wasteful useof high pressure live steam. When the water temperatures do not fluctuate ,much, the regulation in accordance with fluctuatidns in this temperature may be omitted; and conversely-when con ifiiqns are such that these water temperatures vary but the exhaust steam pressure is substantiallyconstant, the meansfor regulating in accordance with the pressure variai nsm e m ted.

- What I :claim is:

1. The combination with an injector having a live-steam supply, an exhaust steam supply, and a water supply, of a valveadapted and arranged to varyythe flow from said live steam supply to the injector, means for applying a force in the direction to close said valve upon increase in pressure of said exhaust steam supply, and means for applying a force in the direction to open said valve upon increase in temperature insaid water supplyI M 2'. "I'he-combination with an-injector of a live steam supply, an exhaust steam supply, a water supply, a valve adapted and arranged to vary the flow from said live steam supply to the injector, and means for applying a forcein the direction to open said valve upon increase in temperature of water in said'water supply.

. ,3,;The,combination with an injector of a live steam supply, an exhaust steam supply, a water supply, a valve adapted and arranged to vary the flow from said live steam supply to the injectona stem for said valve, an expansible chamber connected to said stem, a connection from said chamber to said exhaust steam supply, a lever-pivoted intermediate its ends, a pivoted connection from said lever to said valve stem, a second expansible chamber, a projection fixed to said second chamber, a pivoted connection between said lever and said projection, and means fordecreasing and increasing the pressure in said second chamber with increase and decrease of the temperature ofsaid-water supply.

4..-.The combination with an injector of a live steam supply, an exhaust steam supply, a Water supply, a valve adapted and arranged to vary the flow from said live steam supply to the injector, combined spring and thermostatic means for applying a force in the direction to open said' 

